A sweet, kickass messenger bag with a seatbelt buckle to hold it that was originally used by bike messengers and soon developed into a very hipster thing to own. Usually one person will have one and over time db friends will steal the idea and call it theirs.

You: OMG!! Have you seen that db at our school? When the fuck did he get a Chrome Bag? I had it first. Such a damn hipster.

Friend: Dude. You stole it from that kid you used to chill with. Doesn't that make you as worse as him?
You: Nope! Cause I had it first here. I'm going to beat his ass!